1/* s_ceill.c -- long double version of s_ceil.c.
2 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
3 */
4
5/*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8 *
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
12 * is preserved.
13 * ====================================================
14 */
15
16#if defined(LIBM_SCCS) && !defined(lint)
17static char rcsid[] = "$NetBSD: $";
18#endif
19
20/*
21 * ceill(x)
22 * Return x rounded toward -inf to integral value
23 * Method:
24 * Bit twiddling.
25 */
26
27#include <math.h>
28#include <math_private.h>
29
30_Float128 __ceill(_Float128 x)
31{
32 int64_t i0,i1,j0;
33 u_int64_t i,j;
34 GET_LDOUBLE_WORDS64(i0,i1,x);
35 j0 = ((i0>>48)&0x7fff)-0x3fff;
36 if(j0<48) {
37 if(j0<0) {
38 /* return 0*sign(x) if |x|<1 */
39 if(i0<0) {i0=0x8000000000000000ULL;i1=0;}
40 else if((i0|i1)!=0) { i0=0x3fff000000000000ULL;i1=0;}
41 } else {
42 i = (0x0000ffffffffffffULL)>>j0;
43 if(((i0&i)|i1)==0) return x; /* x is integral */
44 if(i0>0) i0 += (0x0001000000000000LL)>>j0;
45 i0 &= (~i); i1=0;
46 }
47 } else if (j0>111) {
48 if(j0==0x4000) return x+x; /* inf or NaN */
49 else return x; /* x is integral */
50 } else {
51 i = -1ULL>>(j0-48);
52 if((i1&i)==0) return x; /* x is integral */
53 if(i0>0) {
54 if(j0==48) i0+=1;
55 else {
56 j = i1+(1LL<<(112-j0));
57 if(j<i1) i0 +=1 ; /* got a carry */
58 i1=j;
59 }
60 }
61 i1 &= (~i);
62 }
63 SET_LDOUBLE_WORDS64(x,i0,i1);
64 return x;
65}
66weak_alias (__ceill, ceill)
67